The life of LED Christmas lights is estimated to be 25,000 to 75,000 hours. Median life span would be 50,000 hours.
If a tree was lit for 24 hours per day for 365 days (1 year), 8,760 hours of bulb life would be used up.
Life span on the low end of 25,000 hours divided by 8,760 (1 year) is 2.85 years before you would expect lights to begin burning out. Life span of 75,000 hours at a maximum, is 8.56 years. Median life span of 50,000 hours is 5.70 years.
Actual Christmas Tree Usage:
1 month with lights on 24 hours per day is 744 usage hours.
25,000 hour minimum life expectancy for LED bulbs is 33.60 years.